http://treetop.rubyforge.org/Treetop is a language for describing languages. Combining the elegance of Ruby with cutting-edge parsing expression grammars, it helps you analyze syntax with revolutionarily ease. sudo gem install treetop Intuitive Grammar Specifications Parsing expression grammars (PEGs) are simple to write and easy to maintain. They are a simple but powerful generalization of regular expressions that are easie
